Grate



(No Model.) 2 sheetssheet 1.

H. P. TALLMADGE.

GRATE.

Patented Mag 7', 1889.

X1 I, I

UNITED STATES PATENT OFFICE.

HIRAM P. TALLMADGE, OF BOSTON, MASSACHUSETTS.

G RAT SPECIFICATION forming part of Letters Patent No. 403,002, dated May 7, 1889.

Application filed May 8, 1888. Serial No. 273,28@ (No model.)

T aZZ whom it may concern.- Be it known that I, I-IIRAM P. TALLMADGE,

' of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Grates, which is fully set forth in the following specification.

This invention relates to that class of grates for furnaces and stoves in which the gratebars can be reciprocated longitudinally for the purpose of clearing the fire. The object of the invention is to simplify, and consequently to cheapen, the construction of the grate and to facilitate the putting together of the several parts thereof, as Well as to improve the operation of the grate.

' The invention consists in certain novel features of construction and combinations of parts, as hereinafter fully set forth.

In the accompanying drawings, which represent a grate constructed in accordance with the invention, Figure 1 is a plan view; Figs. 2, 3, and 4, longitudinal sections on lines fu c, w w, and 0c cc, respectively 5 Figs. 5 and 6, crosssections on lines y y and a a', respectively; and Figs. 7, 8, and 9 are detail views.

The construction of the grate is in some respects similar to that described in my patent, No. 379,740, dated March 20, 1888.

The rectangular frame A represents the Walls of the ash-pit of a furnace in Which the grate is hung, said grate resting upon two cross-bars, B, extending across the ash-pit. No fastenings are used to secure the grate in place, and it can be readily taken out and re placed Whenever necessary.

C C are the side bars of the grate, and are connected at one end to the front header, D, and at the other to the rear header, E. For the purpose of making a detachable connection the bars C have at their rear ends angular plates c, having tongues on their under sides. The horizontal portions of plates clap over the ends of header E, the tongues taking into corresponding grooves in said headers, as clearly shown in Fig. 5.

F is the rear bearing-bar. It has dovetailed tenons on its ends and is hung in mortises in brackets f depending from side bars, C.

The rock-bar G, having knife-edge bearings at its ends, is hung in slots b in the brackets g, depending from said side bars. These parts constitute the frame and operating mechan ism by which the grate-bars are supported and reciprocated.

The rear header, E, isof approximately tri angular shape in cross-section, having an inclined face extending down to the surface of the grate-bars. The header is composed of a series of solid triangular Webs, 2, and a series of inclined ribs, 8, alternating With the Webs 2, there being an open space between each Web 2 and the adjacent rib 3. Through these openings the ashes can pass down and the air can pass up freely, circulating under ribs 3 and over the tops of the grate-bars, cooling these parts and preventing their speedy destruction by burning. The inclined face of the header E prevents any accumulation of ashes thereon, and also assists in feeding down the fuel toward the center of the grate. On the under side of the header E are ribs or flanges 4 in line with the Webs 2 and forming guides for the grate-bars.

The brackets g, supporting the rock-bar G, have a channel or mortise extending through them of the size of the side bars, C. Consequently brackets g can be moved along the bars C to any position, and the bars O cut off in the sand to the length desired. As the grate-bars also admit of being cut off to the desired length, the same patterns will serve for the construction of grates of different sizes.

In the under sides of bars C, near their rear ends, are cast lugs or projections 5. The rear bearing-bar, B, passes between these and brackets f, and thus longitudinal motion of the grate is prevented.

The gratefbars H are connected With the rock-bar G substantially in the manner described in my aforesaid patent-that is to say, some of the bars H have notches 6, Fig. S, which engage edge-bearings on the top of the rock-bar G, While the alternate bars H have depending arms 7, notched at their ends for engagement with bearings formed in slots in the rock-bar G below its axis of oscillation. Vhen the shaking-handle L is inserted in socket Z in the rock-bar G and the latter oscillated on its bearings, the grate-bars Hwill all be reciprocated, adjacent bars moving in opposite directions.

At their rear ends the grate-bars H all rest upon tilting pieces K of peculiar construction. (See Fig. 9.) These pieces have on their under sides deep notches, by means of Which they are held in place and can rock upon the upper edge of bearing-bar F. The pieces K have curved upper surfaces, the curve being preferably an are of a circle, so that the bars can move back and forth Without change of level. These curved edges are provided with grooves k, in which the gratebars rest, by which displacement of the parts is prevented. This obviates the necessity of a notch in the edge of the grate-bar and of the use of a core in casting for the formation of such notch.

The different parts of the grate are easily assembled and taken apart, and they are held together Without screws, bolts, or similar fastening devices.

It is obvious that parts of the invention can be used without others, and that modifications can be made in the details of construction VWithout departing from the spirit of the invention.

Having nowfully described my said inven tion, what I claim, and desire to secure by Letters Patent, is-

l. rIhe combination, with the gratebars, of the 1'oekba1's connected therewith so as to impart a reciprocating motion thereto, the side bars, and the brackets having bearings for said. rock-bars, said brackets being hung on said side bars and being adjustable length- Wise thereof, substantially as described.

2. The combination, with the movable grate# bars, the side bars, and the mechanism for supporting and operating` said grate-bars, of

the header extending entirely across said grate from side to side and having an inclined face, and composed of solid triangular Webs alternating With ribs, as specified, with open spaces between said Webs and ribs, substantiallyas and for the purpose set forth.

3. The combination, with the grate-bars and means for supporting and operating the same, of the header approximately triangular in cross-section, composed of alternate Webs and ribs with intermediate air-spaces and having on its under side iianges forming guides for said grate-bars, substantially as described.

4. The combination, with the side bars, the bearing-bar supported thereby, and the series of movable gratebars, of the tilting supports, one for each gratebar, said supports having curved upper edges upon which the grate-bars loosely rest, and notches on their under sides for engagement with said bearing-bar, so that adjacent grate-bars are free to reciprocate in opposite directions, substantially as described.

5. The combination, with the side bars, bearing-bar, and movable grate-bars, of the tilting supports having curved upper edges provided with groovesin which the grate-bars rest, and notches on their under sides for engaging and rocking on the edge of said bean ingbar, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscrib ing witnesses.

HIRAM P. 'lALLllI/YXDGE.

Witnesses:

O. M. SHAW, F.. M. SPINNICY'. 

